The news last week from Saturn’s moon Enceladus was thrilling. The possibility of life elsewhere in the solar system suddenly seems highly plausible.
Less than two years ago, scientists of the Cassini-Huygens project announced that the Cassini probe orbiting Saturn had found evidence that Enceladus has an ice-covered ocean that envelops the little moon. It was discovered through analyzing the moon’s wobble, which was different from what it would have been if Enceladus were solid. The motion